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  1. M

    adding another pump to a combi heating system

    I have a Worcester 30cdi combi system which is 15 moths old now, i have just added 3 new rads onto the system as a result of a new extension 12 rads complete in total, the new rads are not getting hot even with all the upstairs rads turned off at trv's and lockshields, the rest of the...
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